Prince Harry encouraged his wife Meghan Markle to write about her personal experience of miscarriage, believing her words could help other families.
The Duchess of Sussex penned an emotional account of losing her second child, saying she "dropped to the floor" after feeling a "sharp cramp" while holding her son, Archie.
In the powerful piece, which was published in the New York Times, she says she watched Harry's heart break as they sat crying in hospital.
Her decision to speak about her loss has been widely praised by people around the world, and has encouraged many who have been too nervous or afraid to do the same to ask for help.
Royal expert Katie Nicholl told True Royalty TV’s The Royal Beat that the Prince encouraged his wife to share the piece.
She explains: "Harry was involved, he didn't write it obviously, these are her words.
"He said I think you should write about this, because if we can help another family going through this then it's a reason to do it.
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"That's why they did it.
"You look at Harry and some of the things he said that you would never expect from a senior royal. The admission that it took years to process the grief over his mother, how he went to counselling.
"When have we ever heard a royal speak like that? When have we ever seen a royal right like that?
"I thought it was incredibly brave."
Katie also explains that the couple have supported each other through the grief.
She said: "I'm told it's brought them even closer together.
"Going through something like this can make or break a relationship."
She tells the programme that Harry phoned his family to tell them the heartbreaking news.
She said: "The royal family were informed.
"My understanding was of course they were supportive at the time. They would have been devastated for the family's loss."
On the programme, the Queen's former press secretary also criticised Netflix's The Crown for implying Prince Charles and Princess Diana were never happy.
He said: “I remember going on tour just after they got married in 1981 and she was the first Princess of Wales in about 80 years, so it was a big deal.
"They couldn’t keep their hands off each other! Charles used to pat her bum regularly!
"There were times when he would even squeeze it, even in Australia. There was a relationship from the beginning. There was genuine love and happiness there.”